Home

What is the correct answer?

4

Thermal diffusivity of a substance is

A. Directly proportional to thermal conductivity

B. Inversely proportional to density of substance

C. Inversely proportional to specific heat

D. All of the above

Correct Answer :

D. All of the above


Related Questions

A non-dimensional number generally associated with natural convection… In heat exchangers, degree of approach is defined as the difference between… Which of the following has maximum value of thermal conductivity? Unit of thermal conductivity in M.K.S. units is The heat transfer from a hot body to a cold body is directly proportional… The total emissivity power is .defined as the total amount of radiation… Emissivity of a white polished body in comparison to a black body is The critical radius is the insulation radius at which the resistance to… Depending on the radiating properties, body will be transparent when Depending on the radiating properties, a body will be white when In heat transfer, conductance equals conductivity (kcal/hr/sq.m/ °C/cm)… If the energy radiated per second per sq. cm. of the surface for wave… The amount of heat flow through a body by conduction is The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl… Which of the following property of air does not increase with rise in… Heat is transferred by all three modes of transfer, viz. conduction, convection… Kirchhoff's law states that Wiens law states that the wave length corresponding to ________ is proportional… According to Newton's law of cooling, the heat transfer from a hot body… The value of Prandtl number for air is about Stefan Boltzmann law is applicable for heat transfer by Heat transfer by radiation mainly depends upon Heat transfer in liquid and gases takes place by The rate of energy transferred by convection to that by conduction is… Thermal diffusivity of a substance is given by (where h = Thermal diffusivity,… In counter current flow heat exchanger, the logarithmic temperature difference… The concept of overall coefficient of heat transfer is used in heat transfer… Total emissivity of polished silver compared to black body is Which of the following would lead to a reduction in thermal resistance? Temperature of steam at around 540°C can be measured by